PARIS (AP) -- French police have arrested four people in a sweep against a suspected neo-Nazi group behind a Web posting that threatened violence.

Police spokesman Didier Gueriaud in the eastern city of Besancon said the arrests early Tuesday in the town of Morteau and the Saone-et-Loire region followed an online posting some 10 days ago linked to a self-described "terrorist group" claiming ties to the "Blood and Honor C18" movement. The C18 code refers to the word "Combat" and the first and eighth letters of the alphabet, "A'' and "H'' -- Adolf Hitler's initials.

Gueriaud said the Web site bore a photo of eight masked militants wielding automatic and other weapons and a message that vowed unspecified attacks. He said more arrests could follow.